Polarized annunciator



(No Model.)

E. P. WARNER.

POLARIZED ANNUNOIATOR.

.No. 448,169. Patented'Mar; 10, 1891.

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ERNEST P. IVARNER, OF CHICAGO, ILLINOIS.

POLARIZED ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 448,169, dated March 10, 1891. Application filed January 9, 1890. fierial No. 336,425. (No model.)

To aZZ whom it may concern:

Be it known that I, ERNEST P. ARNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Polarized Annunciators, (Case 32,) of which the following is afull, clear, concise, and exact description, reference be ing had to the accompanying drawings, forming a part of this specification.

My invention relates to polarized electric annunciators or drops of the class used,for example, in telephone-exchange systems.

The object of my invention is to provide an annunciator which shall be compact in form and more readily responsive to current in a given direction and less liable to be accidentally deranged or thrown down than those heretofore in use.

My invention consists in providing, in connection with the poles of the electro-magnet, a pivoted permanent magnet connected with the lever or catch, which holds the shutterso arranged that current in one direction will cause the pivoted permanent magnet to turn upon its pivot and thereby lift the hook or detent to release the drop, while current in the opposite direction will only serve to hold the pivoted permanent magnet in position to more securely hold the said hooked lever in engagement with the drop to prevent the drop from falling.

The electro-magnet is provided with a softiron casing or shield extending from the heel thereof to the front or polar end thereof, so that one pole of the electro-magnet shall sun round the other pole, and shall be in such position as to permit the opposite poles of the permanent magnet to be placed within the ring or end of the cylinder forming the outer pole and on opposite sides of the inner pole. Extending from the polar end of the magnet are brass or other non-magnetic supports, between which the permanent magnet is mounted. r The permanent magnet is preferably carried by a yoke pivoted between these non-magnetic supports, and the hooked lever or detent is preferably rigidly secured to the same yoke.

In my patent, No. 420,422, dated January 28, 1890, for current-direction indicator, I have shown a pivoted permanent magnet with its poles in a somewhat analogous relation to the poles of an electro-magnet.

My invention will be readily understood by reference to the accompanying drawings, in which Figure l is an enlarged longitudinal sectional view of a polarized electro-magnetic drop or annunciator embodying my invention. Fig. 2 is a plan view thereof. Fig.3 is a rear elevation of the same.

Like parts are indicated by similar letters of reference throughout the different figures.

The soft-iron shield a surrounding the spool forms at a a ring about the central pole Z) of the electro-magnet. The pole b and the pole at are preferably extended, as shown, so" that there may be an annular space between them adapted to receive the poles of the permanent magnet, this annular space being sufficien tly great to permit the permanent magnet to vibrate, preferably vertically, when placed in position, as shown. The frame or support 0 is of brass or like non-magneticmaterial and is provided with two arms or lugs, between which the yoke cl is pivoted. This yoke carries the permanent magnet e and also the hook f. Now, as is well understood, the poles to b with current of a given direction will be of opposite sign. The different poles 9 7b are also permanently of opposite sign. Therefore these poles will influence each other by attraction and repulsion, according to the well-known law, poles of like sign repelling, and poles of opposite sign attracting, one another. The sign of the poles to and b will be reversed when the current is reversed. Therefore, in order to move the permanent magnet on its pivot in a direction to lift the hook f, the current must be of the proper direction, which may be predetermined.

It should be observed that the yoke, permanent magnet, and hook are pivoted near their common center of gravity, yet so that the hookfwill normally remain in engage ment with the shutter 2'. Thus only a slight excitation of the electro-magnet in the proper direction is required to tilt the permanent magnet so as to lift the hook f and release the shutter '5.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1.. The combination, with the electro-magnet/having the annular space between the poles thereof, of a pivote permanent magnet having its poles in said annular space, whereby said permanent magnet is vibrated by changes in the direction of the current, substantially as and for the purpose specified.

2. The combination, with the electro-magnet, of the permanent magnet, the central pole of said electro-magnet being placedbetween the poles of said permanent magnet, said permanent magnet being pivoted and carrying a hook normally in engagement with the shutter, whereby on sending current through said magnet in the proper direction the hook is lifted to release the shutter, substantially as and for the purpose specified.

3, The electro -1nagnet provided with the soft-iron shield extending to surround the central pole of the core of said electro-magnet, an annular space being thus formed between the two poles of said electro-magnet, in combination with a pivoted permanent magnet adapted to vibrate in a vertical plane, the poles of said permanent magnet being included in said annular space, a hook connected with said permanent magnet and the shutter, substantially as and for the purpose specified.

In Witness whereof I hereunto subscribe 30 my name this 18th day of December, A. D. 1889.

ERNEST P. VARNER. Witn esses:

GEORGE P. BARTON, ELLA EDLER. 

